DESIGN. Harlyn Ultrasonic Oil Diffuser features a natural bamboo design that will fit most rooms and homes. Designed in the US, its cylindrical shape is ideal to diffuse water and oil efficiently. OPERATING MODES. Intermittent and Continuous modes are available to operate the diffuser. Intermittent is ideal if you are in small rooms, and continuous if you are in a bigger space to make sure that the scent is constantly diffused. AUTO SHUT OFF. With the auto shut off feature, you don’t have to worry about turning it on at night and leaving it on when you leave your home. AROMATHERAPY. Harlyn Ultrasonic Oil Diffuser is specially designed to maximize aromatherapy experience. It diffuses oils effectively and efficiently. Feel the difference with Harlyn Diffuser! COVERAGE. The ideal coverage for Harlyn is 400 square feet with a run time of up to 5 hours.